Vulnerability in Siemens Nucleus Net
CVE-2021-27393
A vulnerability has been identified in Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2013.08), Nucleus Source Code (Versions including affected DNS modules). The DNS client does not properly randomize UDP port numbers of DNS requests. That could allow an attacker to poison the DNS cache or spoof DNS resolving.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.008 (54.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000
Affected products
- Siemens Nucleus Net — versions All versions
- Siemens Nucleus Net
- Siemens Nucleus Readystart V3 — versions All versions < V2013.08
- Siemens Nucleus Readystart V3
- Siemens Nucleus Source Code — versions Versions including affected DNS modules
- Siemens Nucleus Source Code
Weakness classification (CWE)
References
- cert-portal.siemens.com/productcert/pdf/ssa-201384.pdf (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-27393?
- CVE-2021-27393 is a medium-severity vulnerability in Siemens Nucleus Net, classified under Use of Insufficiently Random Values. CVSS score: 5.3/10. Published 2021-04-22.
- How severe is CVE-2021-27393?
- Medium severity. CVSS v3 base score is 5.3 out of 10.